7.1.3 or 7.2 or 8.0 ????

my question is rather simple: since I have to start an important installation in an industrial environment, and once settled it would be really difficult to change/upgrade due to the fact the factory is heavily running 24/7, I would like to understand how far away (more or less) are the different versions of Tigase.

I mean, I played a bit with 7.1.3 and it's ok, but since the 7.2 it will bring huge changes, and the 8.0 is at the horizon.... I am a bit lost and at least I would like to understand how far this versions are.

Months and months ago I wrote in the forum a question about 7.2 and it was seeming just around the corner but.... here we are, 7.1.3 and no 7.2.